Intercomparision of Spring Soil Moisture among Multiple Reanalysis Datasets over Eastern China
【摘要】：Statistical characteristics of spring soil moisture in different reanalysis datasets of ERA-Interim, MERRA, JRA-25, CFSR and NCEP/NCAR-R1 are intercompared with each other and with the in situ observations over China. The results show that, the reanalyses can reproduce a gradual increase of soil moisture from northwestern China to northeastern and southeastern China in observations except NCEP/NCAR-R1. MERRA presents the best climatological soil moisture among them. Only ERA-Interim can well represent the interannual variations of observed soil moisture. The first EOF mode of observed soil moisture demonstrates that the variability of soil moisture is most robust in the mid-latitude zone of eastern China and the ERA-Interim is the best in reproducing the spatial and temporal features. The reasons causing differences between reanalyses of soil moisture are also investigated in terms of two main factors affecting soil moisture, precipitation and evaporation. The results indicate that the soil moisture differences among these reanalyses depend on their capabilities in reproducing the observed relations of soil moisture to precipitation and evaporation. The ERA-Interim can well reproduce the observed precipitation and evaporation as well as their relations to soil moisture, resulting in a preferable ability to represent the spatial and temporal characteristics of observed soil moisture.